A note preceding the letter from Pickens mentioned that his website and social media accounts are now maintained by team members of the foundation he founded.
In the letter, Pickens writes about advice he's given to people over the course of his life, his admiration for how young people embrace change and some lessons he learned.
He also went over a series of key principles he kept to and collected throughout his life. They range from humbleness and physical fitness to faith and learning from mistakes.
A funeral service for Pickens will be held Thursday in Dallas.
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